If you’ve got a DSLR you’ve probably had the experience of uploading your photos onto your computer after a long day of photography - only to find that there are dark ’spots’ and ‘blotches’ on your pictures.
These spots and blotches appear on all your shots in exactly the same position. They might be less noticeable on backgrounds with lots of detail (and more noticeable on plain backgrounds (like blue skies - especially when you have a small aperture) - but they’re there in all your shots (the picture to the left is one of the worst examples I’ve seen - and was the result of poor image sensor cleaning technique).
The reason for these marks is that you’ve almost certainly got dust on your camera’s image sensor.
Source: Digital Photography School, by Darren Rowse
Full Story: http://digital-photography-school.com/how-to-avoid-a-dirty-dslr-image-sensor
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